This article focuses on WCPI as a pool configuration. The weights are set at pool creation; individual liquidity providers cannot change them when adding funds to an existing pool.
WCPI pools let you pick custom weights for each token in the pool — for example, 80/20 instead of a 50/50 split. That means the larger-weighted asset experiences less slippage when people swap against it.
Note: WCPI pools on STON.fi currently contain two assets per pool, like other pool types. The flexibility comes from weighting between those two assets, not from supporting more than two tokens in a single pool.
Choosing custom weights changes how exposure is distributed and how the pool reacts to price movement — it doesn't guarantee lower risk or lower impermanent loss in absolute terms.